If you have your own backups, use chdman (included with MAME). The command is simple: chdman createcd -i "game.iso" -o "game.chd"
Unlike scrubbed or trimmed ISOs, CHD is entirely lossless. You can decompress a CHD back into its original, identical ISO format at any time.
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: Do not compress your CHD files into .zip or .7z archives. CHD is already highly optimized; putting them inside zip folders will break emulator compatibility and won't save any extra space.
For multi-bin or cue-sheet games, CHD collapses everything into one clean, easily scrapable file for frontends like LaunchBox, EmulationStation, or RetroArch. Top PS2 ROMs Perfect for CHD Compression If you have your own backups, use chdman
, keeping a master "Top Games" list in CHD ensures that your PC backup remains compact while staying 100% "redump" compatible—meaning the data can be restored to a perfect bit-for-bit copy of the original disc at any time. The "Must-Have" CHD Library
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The PlayStation 2 (PS2) remains one of the greatest video game consoles of all time, boasting a massive library of legendary titles. However, building a digital collection of these games can quickly drain your hard drive space, as standard ISO files typically range from 1 GB to over 4 GB each.
Once finished, you will find your brand new .chd files alongside your old ISOs. You can now safely backup or delete the original ISO files to reclaim your hard drive space. Emulator Compatibility